In this paper, we present the analysis of the planetary lensing event KMT-2018-BLG-1743.
The event was reinvestigated in the project of reanalyzing anomalous events, for which lensing
light curves could not be explained by either a 2L1S or a 1L2S model, among the previous
lensing events detected in and before the 2019 season by the Korea Microlensing Telescope
Network [1]}. This project has led to the discoveries of the 3L1S
events OGLE-2018-BLG-1700 [2]} and OGLE-2019-BLG-0304 [3]}, in which
the lenses have three components (planets in binary systems), the 2L2S event KMT-2019-BLG-0797
[4]}, in which both the lens and source are binaries, and the 3L2S event KMT-2019-BLG-1715
[5]}, in which the lens have three components and the source is composed of two stars.
Here the notation “3L” indicates that the lens is a triple system. The event KMT-2018-BLG-1743
was known to be anomalous, but no detailed analysis has been presented due to the difficulty of
explaining the anomalies with a three-object model. In this work, we check the feasibility of
interpreting the KMT-2018-BLG-1743 light curve with the introduction of an extra lens or source
component.
